Adjusment for the backs of type-writer chairs.



C. J. TRAVERS.. ADJUSTMENT FOR THE BACKS 0F TYPE WRITER CHAIRS. APPLICATION msn SEPT. 4, 1911.

1.,253,1-' 9.` Patented Apr. 16, 1918.

l w rfi CHARLES J'.

carica.

TRAVERS, OF PORT WASHINGTON, WISCONSIN.

ADJUSTMENT FOR THE BACKS 0F TYPE-WRITER CHAIRS.

Specification of Letters Patent.

Patented Apr. ie, 1918'.

Application filed September 4, 1917. Serial No. 189,517.

To all whom z't may concern:

Be it known that I, CHARLES J. TRAVERS, a citizen of the United States, residing at Port Washington, in the county of Ozaukee, State of Wisconsin, and useful Adjustment for the Backs of Type-Writer Chairs, of 4which the following is a specification. Y

rlhis invention relates to improvements in that class of chairs for type-writer operators and others, wherein an adjustable springsupported back-standard is employed; and the principal objects of the invention are to increase `the rigidity, durability, and lightness of the adjustment, and at the same time, reduce the cost of manufacture and provide conveniently accessible means for regulating the spring-tension and the inclination and elevation of the back-standard as Well as the back-pad carried thereby.

Other objects of the invention will hereinafter appear, and the novel features thereof will be more particularly pointed out in the appended claims.

Referring to the drawing:

Figure 1 is a top plan view of an adjustment for type-writer chairs embodying my invention, the front portions of the spiderarms being broken away to conserve space, and the back standard supporting-arm and the back-standard being shown partly and wholly in section, respectively.

Fig. 2 is a side elevation of the same, the back-standard being broken away at its upper portion and its lower end shown in vertical section;

Fig. 3 is a detail in perspective of the hollow or tubular bridge-piece;

Fig. 4 is a similar view in detail of the back-standard supporting-yoke; and

Fig. 5 is a detail in plan of the springsupporting clip. Y v

Similar numerals of reference indicate similar parts in all the figures of the drawing.

ln practising my invention I employ opposite companion spider-arms 1, such being preferably formed of sheet-metal angle-iron, and arranged so that their upper horizontal flanges are outwardly disposed. These arms 1 may be coimected at their rear ends by a transverse brace 2, the ends of which overlap the spider-arms and are riveted thereto,

have invented a newv upset or headed. In this manner,

three parts-the two spider-l 1 arms and the Vbridge--are as rigid as if as at 3. The ends of the spider-arms are provided with apertures 4c, for the reception of screws by means of which the seat (not shown) may be secured in position.

At about their middles, the spider-arms may and preferably are connected by a hollow or tubular bridge 5, andthe same is preferably formed of two interlocking sections, designated, respectively, as theV upper section 6 and the lower section The section 6 is preferably of inverted U-.shape in cross-section and formedwith the opposite depending sides 8, the latter having formed in their lower edges and about midway their lengths, shallow mortises 9. The section 7 is preferably a flat plate, corresponding in length with the section 6 and of a width adapting it to fit between the depending sides 8, and at opposite sides is provided with tenons 10, corresponding to and adapted to enter and snugly it within the mortises 9, By' means of the mortises and tenons 9 and l0, and the embracing depending sides of the upper section, it will be seen that the two sections are securely and immovably in- Y terlocked together, the two sections being tube-like in form and appearance and capable. of successfully resisting the lateral strains to which they are necessarily subjected in theordinary use of the chair.' The opposite ends of vthe tubular bridge are formed with tenons 11, located at intervals,

and these enter corresponding mortises 12', I

formed in the vertical flanges of the spiderarms 1, beyond which the said tenons are it will be observed, these formed in one piece, all rivets being avoided.

The upper and 'lower sections 6 and 7 forming the bridge are provided with vertically alining apertures .13, and these, receive the upper reduced end of the usual supporting-standard 14. By reducing this standard at its upper end, which is the usual practice, a shoulder is formed at the lower end of the reduction, and u on this shoulder is seated the'lower section of the bridge. If desired,

a short spacing-sleeve 6a, (see dotted lines` i Fig. 2) may encircle the reduced upper end of the supporting-standard 14, the samebeinglocated between the upper and lower sectionsy 6 and,7 of the bridge..

` If employed, y

adjustments may be regulated by simple means readily accessible to the occupant of the chair..

Having described claim is:

l. In a chair-adjustment, the combination with opposite 'spider arms formed of sheetmetal and angular in cross-section, of a connecting tubular bridge, the ends of the bridge being provided with tenons and the vertical webs of the spider-arms having corresponding mortises receiving the tenons, and the latter being upset at their ends.

2. In a chair-adjustment, the combination with opposite spider-arms formed of sheetmetal and having mortises, of a connecting bridge, angular in cross-section and formed of sheet-metal and having tenons at its ends engaging said mortises.

3. In a chair-adjustment, the combination with opposite spider-arms formed of sheetmetal and having mortises, of a connecting bridge, sisting of an upper inverted U-shaped section and a lower lat section engaging the depending sides of the upper section, said bridge having tenons at its ends engaging the mortises of the spider-arms.

4. In a chair-adjustment, the combination with opposite sheet-metal spider-arms' provided with mortises, of a connecting bridge, tubular in cross-section, and comprising an upper inverted U-shaped section, the lower edges of the sides of which are provided with shallow mortises, and a lower at section received by the opposite depending sides of the upper section and provided at my invention, what I its opposite edges with tenons interlocking with said mortises of the upper section, the

Copies of tubular in cross-section, and contwo sections being provided with end-tenons engaging the mortises of the spiderarms.

5. In a chair-adjustment, the vcombination with opposite spider-arms formed of sheetmetal and having mortises formed in their vertical webs, of a tubular bridge comprising upper and lower interlocking sections each provided with a central aperture and with end-tenons received by the mortises of the spider-arms, beyond which said end. tenons are upset and an adjusting-standard reduced below its upper end to form a shoulder and having its upper reduced end passed through the central aperture of the bridge, above which latter the adjustingstandard is headed, the shoulder of said 'standard engaging under the bottom of said bridge.

6. In a chair-adjustmenathe combination with opposite spider-arms formed of sheetmetal and provided with mortises, of a tubular bridge having tenons at its ends entering said mortises, said bridge being composed of upper and lower sections interlooked to resist independent movement and provided with alining apertures, an adjusting standard reduced at its upper end and passing through said apertures and having its shoulder', formed by said reduction, resting against the underside of the lower section, and a spacing-sleeve encircling the reduced portion of the standard and interposed between the upper and lower sections of the bridge.

CHARLES J. TRAVERS.

Witnesses:

T. A. BOERNER, -W. S. DUVALL.

Washington, D. 0.

this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, p 

